JP2009209298A - Transparent resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a molded article which uses an amorphous cycloolefin-based resin having high transparency with a wide-range molding condition, and to improve the transparency of the molded article which uses an amorphous cycloolefin-based resin. <P>SOLUTION: The transparent resin composition containing the amorphous cycloolefin-based resin, a metal resinate, an aliphatic acid ester or an aliphatic acid amide, and a metal salt of an aliphatic acid is used. It is preferable that the metal element of the metal rosinate and that of the metal salt of the aliphatic acid is of the same kind, and it is further preferable that the metal element of the metal rosinate is magnesium. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a transparent resin composition having high transparency using an amorphous cyclic olefin resin.

  Amorphous cyclic olefin resin is a resin having a cyclic olefin skeleton in the main chain, and has high transparency, low birefringence, high heat distortion temperature, light weight, dimensional stability, low water absorption, and hydrolysis resistance. It is a resin with many features such as chemical resistance, low dielectric constant, low dielectric loss, and no inclusion of environmental load substances. For this reason, amorphous cyclic olefin resins are used in a wide variety of fields where these characteristics are required.

  In particular, amorphous cyclic olefin-based resins are used in industries such as lenses, light guide plates, diffraction gratings and other optical devices, architecture and lighting fields because they can exhibit high heat resistance, high transparency, and low birefringence. It is used as a material for transparent molded products.

  By the way, the amorphous cyclic olefin-based resin sometimes hinders the transparency of the molded product by generating a spray mark on the surface of the molded body during molding. Such inhibition of transparency is known to be due to the gelling component of the amorphous cyclic olefin resin. The merchantability and performance of the molded product may be impaired due to the loss of transparency and surface smoothness of the molded product. It has been said that these problems can be solved by adding a fatty acid amide or a fatty acid metal salt as a lubricant to an amorphous cyclic olefin resin (Patent Documents 1 and 2).

  Here, the spray mark is a kind of flow mark that appears on the surface of the molded body. The cause of the generation of the spray mark is a gelling component of the cyclic olefin resin generated during plasticization of the resin in injection molding. When the resin is filled into the mold, the gelled component is transferred to the mold surface, so that the surface smoothness is lost, and further, the performance and commercial properties of the molded body are impaired.

However, when adding a fatty acid amide lubricant to an amorphous cyclic olefin resin, when adding a fatty acid metal salt to an amorphous cyclic olefin resin, or a fatty acid amide and an amorphous cyclic olefin resin. Even when a fatty acid metal salt is added, the generation of gel components cannot be effectively suppressed.
Japanese Patent Laid-Open No. 9-104061 JP 2006-321902 A

  Even if the techniques described in Patent Documents 1 and 2 are used as described above, the generation of the gel component cannot be effectively suppressed, and a highly transparent amorphous cyclic olefin resin is used. There is a problem that the width of the molding conditions for obtaining the molded body is narrow. Along with the improvement of the transparency of the amorphous cyclic olefin-based resin molded body, further improvement is required.

  The present invention has been made to solve the above-described problems, and its purpose is to suppress the generation of spray marks appearing on the surface of the molded body, and to mold using a highly transparent amorphous cyclic olefin resin. An object of the present invention is to provide a transparent resin composition that enables a body to be molded under a wide range of molding conditions.

  The inventor of the present invention has intensively studied to solve the above problems. As a result, the gel component generated by shearing caused by friction between the resin pellets during plasticization tends to be suppressed by blending a fatty acid ester or a fatty acid amide with an amorphous cyclic olefin resin. Gel components generated by shearing caused by friction between resin pellets and screws or barrels of injection molding machines, etc. tend to be able to be suppressed by adding a fatty acid metal salt to an amorphous cyclic olefin resin. In addition, the inventors have found that the generation of gel components can be effectively suppressed by adding a rosin acid metal salt to the amorphous cyclic olefin-based resin, and the present invention has been completed. More specifically, the present invention provides the following.

  (1) A transparent resin composition containing an amorphous cyclic olefin-based resin, a rosin acid metal salt, a fatty acid ester or a fatty acid amide, and a fatty acid metal salt.

  (2) The transparent resin composition according to (1), wherein the metal element of the rosin acid metal salt and the metal element of the fatty acid metal salt are of the same kind.

  (3) The transparent resin composition according to (1) or (2), wherein the metal element of the rosin acid metal salt is magnesium.

  (4) The transparent resin composition according to any one of (1) to (3), wherein the fatty acid ester or fatty acid amide is at least one selected from pentaerythritol tetrastearate and ethylene bisstearyl amide.

  (5) The transparent resin composition according to any one of (1) to (4), wherein the fatty acid metal salt is at least one selected from calcium stearate, magnesium stearate, and zinc stearate.

  (6) The content of the rosin acid metal salt is 0.1% by mass to 5% by mass, and the content of the fatty acid ester or fatty acid amide is 0.1% by mass to 3% by mass (1). To (5). The transparent resin composition according to any one of (5) to (5).

  (7) The content of the rosin acid metal salt is 0.1% by mass to 5% by mass, and the content of the fatty acid metal salt is 0.01% by mass to 0.1% by mass (1). To (6). The transparent resin composition according to any one of (6).

  (8) An optical component formed by molding the transparent resin composition according to any one of (1) to (7).

  According to the present invention, by blending a rosin acid metal salt, a fatty acid ester or a fatty acid amide, and a fatty acid metal salt with respect to an amorphous cyclic olefin-based resin, friction between resin pellets during plasticization is achieved. It effectively suppresses both the gel component generated by shear caused by shearing and the gel component generated by shear caused by friction between the resin pellets during plasticization and the screw or barrel of an injection molding machine, etc. Therefore, the transparency can be improved and the range of molding conditions can be expanded.

  Hereinafter, an embodiment of the present invention will be described in detail. However, the present invention is not limited to the following embodiment, and may be implemented with appropriate modifications within the scope of the object of the present invention. it can.

  The transparent resin composition of the present invention refers to an amorphous cyclic olefin system that can suppress the generation of gel components that occur during molding of an amorphous cyclic olefin resin and maintain the transparency of the resulting molded body. It refers to a transparent resin composition mainly composed of resin. Transparency is not particularly limited as long as it transmits at least a part of visible light, but when used as an optical component, depending on the use, the molded body is measured at an optical path length of 2 mm. In some cases, high transparency with a light transmittance of 80% or more at a wavelength of 400 nm to 750 nm may be required. If the transparent resin composition of the present invention is used, it is possible to suppress the generation of a gel component during molding, and thus it is possible to easily realize high transparency necessary for an optical component.

  Hereinafter, the present invention will be described in the order of amorphous cyclic olefin resin, rosin acid metal salt, fatty acid ester or fatty acid amide, and fatty acid metal salt.

<Ingredients contained in transparent resin composition>
[Amorphous cyclic olefin resin]
Hereinafter, the amorphous cyclic olefin resin that is an essential component of the transparent resin composition of the present invention will be described. The amorphous cyclic olefin resin used in the present invention is not particularly limited as long as it contains a cyclic olefin component as a copolymerization component and is a polyolefin resin containing a cyclic olefin component in the main chain. For example,
(A1) Cyclic olefin addition polymer or hydrogenated product thereof,
(A2) an addition copolymer of a cyclic olefin and an α-olefin or a hydrogenated product thereof,
(A3) A ring-opening (co) polymer of a cyclic olefin or a hydrogenated product thereof.

In addition, as an amorphous cyclic olefin-based resin containing a cyclic olefin component used in the present invention as a copolymerization component,
(A4) A resin obtained by grafting and / or copolymerizing an unsaturated compound having a polar group to the resins (a1) to (a3).

  Examples of the polar group include a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, and a hydroxyl group. Examples of the unsaturated compound having a polar group include (meth) acrylic acid and maleic acid. Acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (meth) acrylate (carbon number 1-10) ester, maleic acid alkyl (carbon number 1-10) ester, (meth) acrylamide, (meta ) 2-hydroxyethyl acrylate.

  The term “amorphous” in the present invention refers to a case where even when a polymer is solidified by being slowly cooled from a molten state, crystal-derived diffraction is not observed in X-ray diffraction, and only amorphous halo is observed. Or in the measurement by a scanning differential calorimeter, it means that there is no primary transition peak derived from crystals other than the glass transition point.

  In the present invention, the amorphous cyclic olefin-based resins (a1) to (a4) containing the cyclic olefin component as a copolymerization component may be used singly or in combination of two or more. . In the present invention, (a2) an addition copolymer of cyclic olefin and α-olefin or a hydrogenated product thereof can be preferably used.

  Moreover, it is also possible to use a commercially available resin as the amorphous cyclic olefin-based resin containing the cyclic olefin component used in the present invention as a copolymerization component. Examples of commercially available amorphous cyclic olefin-based resins include TOPAS (registered trademark) (manufactured by Topas Advanced Polymers), Apel (registered trademark) (manufactured by Mitsui Chemicals), Zeonex (registered trademark) (Nippon Zeon Corporation). Product), Zeonoa (registered trademark) (manufactured by Nippon Zeon Co., Ltd.), Arton (registered trademark) (manufactured by JSR Corporation), and the like.

（式中、Ｒ^１〜Ｒ^１２は、それぞれ同一でも異なっていてもよく、水素原子、ハロゲン原子、及び、炭化水素基からなる群より選ばれるものであり、
Ｒ^９とＲ^１０、Ｒ^１１とＲ^１２は、一体化して２価の炭化水素基を形成してもよく、
Ｒ^９又はＲ^１０と、Ｒ^１１又はＲ^１２とは、互いに環を形成していてもよい。
また、ｎは、０又は正の整数を示し、
ｎが２以上の場合には、Ｒ^５〜Ｒ^８は、それぞれの繰り返し単位の中で、それぞれ同一でも異なっていてもよい。） The addition copolymer of (a2) cyclic olefin and α-olefin preferably used in the composition of the present invention is not particularly limited. Particularly preferred examples include a copolymer containing [1] an α-olefin component having 2 to 20 carbon atoms and [2] a cyclic olefin component represented by the following general formula (I).

(Wherein R ^{1 to} R ¹² may be the same as or different from each other and are selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group;
R ⁹ and R ¹⁰ , R ¹¹ and R ¹² may be integrated to form a divalent hydrocarbon group,
R ⁹ or R ¹⁰ and R ¹¹ or R ¹² may form a ring with each other.
N represents 0 or a positive integer;
When n is 2 or more, R ^{5 to} R ⁸ may be the same or different in each repeating unit. )

[[1] α-olefin component having 2 to 20 carbon atoms]
The C2-C20 alpha-olefin used as the copolymerization component of the addition polymer of the cyclic olefin component preferably used for this invention and other copolymerization components, such as ethylene, is not specifically limited. For example, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, 1-octene, 1-octene, Examples include decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicocene. These α-olefin components may be used alone or in combination of two or more. Of these, ethylene is most preferably used alone.

[[2] Cyclic olefin component represented by formula (I)]
In the addition polymer of the cyclic olefin component preferably used in the present invention and another copolymer component such as ethylene, the cyclic olefin component represented by the general formula (I) serving as the copolymer component will be described.

R ^{1 to} R ¹² in the general formula (I) may be the same or different and are selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group.

Specific examples of R ^{1 to} R ⁸ include, for example, a hydrogen atom; a halogen atom such as fluorine, chlorine and bromine; a lower alkyl group such as a methyl group, an ethyl group, a propyl group and a butyl group. May be different from each other, may be partially different, or all may be the same.

Specific examples of R ^{9 to} R ¹² include, for example, hydrogen atom; halogen atom such as fluorine, chlorine, bromine; methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, hexyl group, stearyl. Alkyl group such as cyclohexyl group; cycloalkyl group such as cyclohexyl group; substituted or unsubstituted aromatic hydrocarbon group such as phenyl group, tolyl group, ethylphenyl group, isopropylphenyl group, naphthyl group, anthryl group; benzyl group, phenethyl And an aralkyl group in which an aryl group is substituted with an alkyl group, and the like. These may be different from each other, may be partially different, or all may be the same.

Specific examples of the case where R ⁹ and R ¹⁰ or R ¹¹ and R ¹² are integrated to form a divalent hydrocarbon group include, for example, alkylidene groups such as an ethylidene group, a propylidene group, and an isopropylidene group. Can be mentioned.

When R ⁹ or R ¹⁰ and R ¹¹ or R ¹² form a ring with each other, the formed ring may be monocyclic or polycyclic, or may be a polycyclic ring having a bridge. , A ring having a double bond, or a ring composed of a combination of these rings may be used. Moreover, these rings may have a substituent such as a methyl group.

  Specific examples of the cyclic olefin component represented by the general formula (I) include bicyclo [2.2.1] hept-2-ene (common name: norbornene), 5-methyl-bicyclo [2.2.1] hepta. 2-ene, 5,5-dimethyl-bicyclo [2.2.1] hept-2-ene, 5-ethyl-bicyclo [2.2.1] hept-2-ene, 5-butyl-bicyclo [2 2.1] hept-2-ene, 5-ethylidene-bicyclo [2.2.1] hept-2-ene, 5-hexyl-bicyclo [2.2.1] hept-2-ene, 5-octyl -Bicyclo [2.2.1] hept-2-ene, 5-octadecyl-bicyclo [2.2.1] hept-2-ene, 5-methylidene-bicyclo [2.2.1] hept-2-ene 5-vinyl-bicyclo [2.2.1] hept-2-ene, - propenyl - bicyclo [2.2.1] of the two rings, such as hept-2-ene cyclic olefin;

Tricyclo [4.3.0.1 ^2,5 ] deca-3,7-diene (common name: dicyclopentadiene), tricyclo [4.3.0.1 ^2,5 ] dec-3-ene; tricyclo [ 4.4.0.1 ^2,5 ] undeca-3,7-diene or tricyclo [4.4.0.1 ^2,5 ] undeca-3,8-diene or a partially hydrogenated product thereof (or cyclopentadiene) Tricyclo [4.4.0.1 ^2,5 ] undec-3-ene; 5-cyclopentyl-bicyclo [2.2.1] hept-2-ene, 5-cyclohexyl-bicyclo [2.2.1] hept-2-ene, 5-cyclohexenylbicyclo [2.2.1] hept-2-ene, 5-phenyl-bicyclo [2.2.1] hept-2-ene A cyclic olefin of the ring;

Tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene (also simply referred to as tetracyclododecene), 8-methyltetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-ethyltetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-methylidenetetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-ethylidenetetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-vinyltetracyclo [4,4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-propenyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] tetracyclic olefins such as dodec-3-ene;

8-cyclopentyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-cyclohexyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-cyclohexenyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-phenyl-cyclopentyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene; tetracyclo [7.4.1 ^3,6 . 0 ^1,9 . 0 ^2,7 ] tetradeca-4,9,11,13-tetraene (also referred to as 1,4-methano-1,4,4a, 9a-tetrahydrofluorene), tetracyclo [8.4.1 ^4,7 . 0 ^1,10 . 0 ^3,8 ] pentadeca-5,10,12,14-tetraene (also referred to as 1,4-methano-1,4,4a, 5,10,10a-hexahydroanthracene); pentacyclo [6.6.1. 1 ^3,6 . 0 ^2,7 . 0 ^9,14 ] -4-hexadecene, pentacyclo [6.5.1.1 ^3,6 . 0 ^2,7 . 0 ^9,13] -4-pentadecene, pentacyclo [7.4.0.0 ^2,7. 1 ^3,6 . 1 ^10,13] -4-pentadecene; heptacyclo [8.7.0.1 ^2,9. 1 ^4,7 . 1 ^{11, 17} . 0 ^3,8 . 0 ^12,16 ] -5-eicosene, heptacyclo [8.7.0.1 ^2,9 . 0 ^3,8 . 1 ^4,7 . 0 ^12,17 . 1 ^13,16 ] ^-14-eicosene ; and polycyclic cyclic olefins such as cyclopentadiene tetramer.

  These cyclic olefin components may be used singly or in combination of two or more. Among these, it is preferable to use bicyclo [2.2.1] hept-2-ene (common name: norbornene) alone.

  [1] A method for polymerizing an α-olefin component having 2 to 20 carbon atoms and a [2] cyclic olefin component represented by formula (I) and a method for hydrogenating the obtained polymer are particularly limited. Instead, it can be carried out according to known methods. Random copolymerization or block copolymerization may be used, but random copolymerization is preferred.

  The polymerization catalyst used is not particularly limited, and can be obtained by a known method using a conventionally known catalyst such as a Ziegler-Natta, metathesis, or metallocene catalyst. The cyclic olefin and α-olefin addition copolymer or hydrogenated product thereof preferably used in the present invention is preferably produced using a metallocene catalyst.

  Examples of the metathesis catalyst include molybdenum or tungsten-based metathesis catalysts (for example, described in JP-A Nos. 58-127728 and 58-129003) as a catalyst for ring-opening polymerization of cycloolefin. In addition, the polymer obtained by the metathesis catalyst uses an inorganic carrier-supported transition metal catalyst or the like, and 90% or more of the main chain double bond and 98% or more of the carbon-carbon double bond in the side chain aromatic ring are hydrogenated. It is preferable to add.

[Other copolymer components]
The (a2) addition copolymer of cyclic olefin and α-olefin, which is particularly preferably used in the composition of the present invention, comprises the above [1] α-olefin component having 2 to 20 carbon atoms and [2] general formula (I In addition to the cyclic olefin component represented by (), other copolymerizable unsaturated monomer components may be contained as necessary within the range not impairing the object of the present invention.

  The unsaturated monomer that may be optionally copolymerized is not particularly limited, and examples thereof include hydrocarbon monomers containing two or more carbon-carbon double bonds in one molecule. Can be mentioned. Specific examples of hydrocarbon monomers containing two or more carbon-carbon double bonds in one molecule include 1,4-hexadiene, 1,6-octadiene, 2-methyl-1,5-hexadiene, 4 A chain non-conjugated diene such as methyl-1,5-hexadiene, 5-methyl-1,5-hexadiene, 6-methyl-1,5-heptadiene, 7-methyl-1,6-octadiene; cyclohexadiene, di Cyclopentadiene, methyltetrahydroindene, 5-vinyl-2-norbornene, 5-ethylidene-2-norbornene, 5-methylene-2-norbornene, 5-isopropylidene-2-norbornene, 6-chloromethyl-5-isopropenyl- 2-norbornene, 4,9,5,8-dimethano-3a, 4,4a, 5,8,8a, 9,9a-octahydro-1H-benzoy Cyclic non-conjugated dienes such as Den; 2,3-isopropylidene-5-norbornene; 2-ethylidene-3-isopropylidene-5-norbornene; may be mentioned 2-propenyl-2,2-norbornadiene and the like. Among these, 1,4-hexadiene, 1,6-octadiene, and cyclic non-conjugated dienes, especially dicyclopentadiene, 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene, 5-methylene-2 -Norbornene, 1,4-hexadiene, 1,6-octadiene are preferred.

[Rosin acid metal salt]
Although the rosin acid metal salt alone does not have the effect of suppressing the generation of gel components, the transparent resin composition of the present invention contains a rosin acid metal salt, whereby a fatty acid ester or fatty acid amide, a fatty acid metal, which will be described later, is added. The effect of suppressing the generation of gel components obtained by blending salts can be enhanced.

  Here, the rosin is a residue obtained by removing turpentine oil by steam distillation of pine resin, that is, pine resin, and is a translucent light yellow solid. About 90% of the rosin component is a resin acid such as abietic acid (Rikagaku Dictionary (4th edition) page 1410). Rosin acid refers to the resin acid.

Abietic acid is a carboxylic acid belonging to a tricyclic diterpene having a structure represented by the following general formula (II), and is also referred to as syllic acid. It is a yellow or resinous powder obtained by leaching pine resin with alcohol, superheated steam distillation or vacuum distillation (Rikagaku Dictionary (4th edition), page 26).

The rosin acid used in the present invention is not limited to the compound represented by the general formula (II), but is a hydrogenated abietic acid represented by the general formula (III), represented by the general formula (IV). Dehydroabietic acid or dihydroabietic acid represented by the general formula (V) may be used.

  In addition, the rosin acid in the present invention may be one kind selected from the group consisting of compounds represented by the above general formulas (II), (III), (IV), and (V), or 2 It may be a mixture of seeds or more.

  When rosin acid is a partial salt, the equivalent of the carboxyl group relative to the equivalent of the metal is not particularly limited. It can be appropriately selected depending on the metal used. For example, when calcium is used as the metal, the equivalent of calcium in the rosin acid partial calcium salt / equivalent (%) of carboxyl groups is preferably 47.5%. When magnesium is used as the metal, the equivalent of magnesium in the rosin acid partial magnesium salt / equivalent (%) of carboxyl groups is preferably about 20%.

  Fatty acid metal salts to be described later tend to suppress gel components generated by shearing caused by friction between resin pellets during plasticization and screws or barrels of an injection molding machine, etc. The gel component generated by the shearing caused by the friction between the resin pellet and the screw or barrel of an injection molding machine cannot be effectively suppressed. However, the combined use of the rosin acid metal salt can enhance the effect of suppressing the generation of the gel component by the fatty acid metal salt. As a result, according to the present invention, a sufficient effect of suppressing the generation of the gel component can be obtained. Although the rosin acid metal salt alone does not have the effect of suppressing the generation of gel components, the reason why the rosin acid metal salt and the fatty acid metal salt, two types of amphiphiles can be enhanced by combining them with the fatty acid metal salt By mixing the active substance, it is presumed that the rosin acid metal salt also exerts a friction reducing action between the pellet and the screw or barrel by the interaction between the two. In particular, if the metal element of the rosin acid metal salt and the metal element of the fatty acid metal salt described later are the same, it is preferable because the side reaction between the additives does not occur and the system becomes stable.

  The compounding ratio of the rosin acid metal salt and the fatty acid metal salt is not particularly limited, but if the ratio of the rosin acid metal salt to the fatty acid metal salt is too high, there may be a problem that the effect of reducing spray marks is low. When the ratio of the fatty acid metal salt to the rosin acid metal salt is too high, there is a possibility that the spray mark reduction synergistic effect due to the addition of the rosin acid metal salt is low. A preferred mass ratio between the rosin acid metal salt and the fatty acid metal salt (rosin acid metal salt: fatty acid metal salt) is about 100: 1 to 1: 1.

  The compounding amount of the rosin acid metal salt is preferably 0.1% by mass to 5% by mass, more preferably 0.5% by mass to 2% by mass. If it is 0.1% by mass or more, the gel component generation preventing effect of fatty acid ester or fatty acid amide or fatty acid metal salt can be further enhanced, and if it is 5% by mass or less, rosin acid metal salt is added to the resin. It is preferable because it does not melt and causes phase separation and does not impair the transparency of the molded body.

[Fatty acid ester or fatty acid amide]
The transparent resin composition of the present invention contains a fatty acid ester or a fatty acid amide. By using a fatty acid ester or a fatty acid amide as a lubricant, it is possible to suppress a gel component generated by shear caused by friction between resin pellets during plasticization.

  There is no restriction | limiting in particular in the fatty acid ester which can be used by this invention, A conventionally well-known thing can be used. For example, fatty acids having 12 to 32 carbon atoms such as lauric acid, palmitic acid, heptadecanoic acid, stearic acid, oleic acid, arachidic acid, behenic acid, monovalent aliphatic alcohols such as palmityl alcohol, stearyl alcohol, behenyl alcohol, It is possible to use an ester compound with a polyhydric aliphatic alcohol such as glycerin, pentaerythritol, dipentaerythritol, sorbitan, a complex ester compound of a fatty acid, a polybasic organic acid and a monohydric aliphatic alcohol, or a polyhydric aliphatic alcohol. it can. Examples of such fatty acid ester lubricants include cetyl palmitate, butyl stearate, stearyl stearate, stearyl citrate, glycerol monocaprylate, glycerol monocaprate, glycerol monolaurate, glycerol monopalmitate, glycerol dipalmitate. Tate, glycerol monostearate, glycerol distearate, glycerol tristearate, glycerol monooleate, glycerol dioleate, glycerol trioleate, glycerol monolinoleate, glycerol monobehenate, glycerol mono12-hydroxystearate, glycerol Di12-hydroxystearate, glycerol tri-12-hydroxystearate, glycerol diacetomonostearate, glycerol citrate fatty acid Ester, pentaerythritol adipate stearate, montanic acid partially saponified esters, pentaerythritol tetrastearate, dipentaerythritol hexastearate, sorbitan tristearate, and the like. These fatty acid ester lubricants can be used alone or in combination of two or more. Among these, pentaerythritol tetrastearate is particularly suitable because it is highly compatible with the amorphous cyclic olefin resin, can maintain the transparency of the molded product, and has a high effect of reducing spray marks. The fatty acid ester lubricant has good compatibility with the amorphous polyester resin, and can improve moldability without impairing the transparency of the resin composition.

  The fatty acid amide lubricant used in the present invention is not particularly limited, and conventionally known ones can be used. For example, saturated fatty acid amides such as lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, hydroxy stearic acid amide; unsaturated fatty acid amides such as oleic acid amide, erucic acid amide, ricinoleic acid amide; N-stearyl stearic acid Substituted amides such as amide, N-oleyl oleic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide, N-oleyl palmitic acid amide; methylol stearic acid amide, methylol behenic acid amide Methylolamide such as methylenebisstearic acid amide, ethylene biscapric acid amide, ethylene bislauric acid amide, ethylene bisstearic acid amide (ethylene bisstearyl amide), ethylene bisisostearyl Acid amide, ethylene bishydroxy stearic acid amide, ethylene bis behenic acid amide, hexamethylene bis behenic acid amide, hexamethylene bis behenic acid amide, hexamethylene bis hydroxy stearic acid amide, N, N′-distearyl adipic acid amide, N Saturated fatty acid bisamides such as N, N'-distearyl sebacic acid amide; ethylene bis oleic acid amide, hexamethylene bis oleic acid amide, N, N'-dioleyl adipic acid amide, N, N'-dioleyl sebacic acid amide, etc. Unsaturated fatty acid bisamides; aromatic bisamides such as m-xylylene bisstearic acid amide, N, N′-distearylisophthalic acid amide, etc., among these, compatibility with amorphous cyclic olefinic resins High transparency of molded body It can be maintained, it and a high effect of splay reduced, since the workability of the transparent resin composition obtained is excellent, and particularly preferably an ethylene bis-stearyl amide.

  The amount of the fatty acid ester or fatty acid amide is preferably 0.1% by mass to 3% by mass. If the blending amount is 0.1% by mass or more, the gel component generated by shear caused by friction between the resin pellets during plasticization can be effectively suppressed, and if it is 3% by mass or less, the molding is performed. It is preferable because it is possible to prevent the occurrence of defects and the decrease in transparency due to the use of a lubricant.

[Fatty acid metal salt]
The fatty acid metal salt used in the present invention refers to a metal salt of a higher fatty acid, such as lithium stearate, magnesium stearate, calcium stearate, calcium laurate, calcium ricinoleate, strontium stearate, barium stearate, barium laurate, Barium ricinoleate, cadmium stearate, cadmium laurate, cadmium ricinoleate, cadmium naphthenate, cadmium 2-ethylhexoate, zinc stearate, zinc laurate, zinc ricinoleate, zinc 2-ethylhexoate, lead stearate, 2 bases Lead stearate, lead naphthenate, etc. Among them, since the processability of the obtained transparent resin composition is excellent and extremely excellent in transparency, calcium stearate, Magnesium phosphate, and particularly preferably zinc stearate.

  In addition, as described above, the combination of the fatty acid metal salt and the rosin acid metal salt effectively suppresses the gel component generated by shear caused by friction between the resin pellets during plasticization and the screw or barrel of an injection molding machine or the like. be able to. And it is preferable if the metal of the fatty acid metal salt and the metal of the rosin acid metal salt are of the same type, since the above effect is further enhanced.

  Fatty acid metal salts are particularly effective in suppressing gel components generated by shearing caused by friction between resin pellets during plasticization and screws or barrels of injection molding machines, and the above-mentioned fatty acid esters or fatty acid amides are particularly plastic. This is effective in suppressing gel components generated by shearing caused by friction between resin pellets during conversion. For this reason, if it is the method of using both together, even if it is a small quantity of lubricant, compared with the conventional one, it is effective in suppression of gel component generation | occurrence | production. In this invention, the effect can be further strengthened by mix | blending a rosin acid metal salt.

  The amount of the fatty acid metal salt is preferably 0.01% by mass to 0.1% by mass. If the blending amount is 0.01% by mass or more, the gel component generated by shearing caused by friction between the plastic pellets during plasticization and the screw or barrel of an injection molding machine can be effectively suppressed. If it is 1 mass% or less, it is preferable because it can prevent problems during molding or decrease transparency due to the use of a lubricant.

[Other ingredients]
The transparent resin composition of the present invention may contain other lubricants if necessary. Examples of other lubricants include hydrocarbon lubricants and alcohol lubricants.

  Further, the transparent resin composition of the present invention may contain additives such as antioxidants and stabilizers as necessary.

<Transparent resin composition>
Although it is often difficult to satisfy all the properties with only one type of lubricant, the transparent resin composition of the present invention is a gel produced during molding by using a fatty acid ester or fatty acid amide and a fatty acid metal salt in combination. Generation | occurrence | production of a component can be suppressed effectively and the said effect which suppresses generation | occurrence | production of a gel component can further be strengthened by mix | blending a rosin acid metal salt there. As a result, according to the present invention, the generation of gel components can be sufficiently suppressed, and the range of molding conditions can be widened such that molding can be performed even at a low injection speed and a low mold temperature.

  The method for producing the transparent resin composition of the present invention can be produced by general mixing and kneading a specific cyclic olefin polymer, a fatty acid ester or a fatty acid amide, and a fatty acid metal salt. Examples of the kneading apparatus include melt kneading apparatuses such as a single screw extruder, a twin screw extruder, a brabender, a roll, a kneader, and a Banbury mixer. Alternatively, a method may be used in which each component is dissolved or dispersed in a solvent and mixed.

  Furthermore, the transparent resin composition of the present invention has a hindered amine light stabilizer, an ultraviolet absorber, a light stabilizer, a near-light stabilizer for the purpose of preventing thermal coloring and light deterioration due to irradiation with light such as visible light, ultraviolet light, and near infrared light. You may contain an infrared absorber etc. as needed. Moreover, you may contain a plasticizer as needed in the range which does not impair transparency in order to provide fluidity | liquidity and toughness. Furthermore, it may contain antioxidants, pigments, antiblocking agents, antistatic agents, surfactants, polymer electrolytes, conductive complexes, inorganic fillers, dyes, oils, etc. as necessary, and the transparency is impaired. Other resin may be contained only when it is not.

  The transparent resin composition of the present invention can be formed into a molded body by a conventionally known molding method, for example, injection molding, injection compression molding, gas assist method injection molding, extrusion molding, multilayer extrusion molding, rotational molding, hot press molding. It can be formed into an injection-molded product, a tube, a sheet, a film, a pipe, a bottle or the like by a method such as blow molding or foam molding. Since the molded body formed by molding the transparent resin composition of the present invention is excellent in transparency, heat resistance and appearance, it can be preferably used particularly for optical parts. In particular, in the production of optical components, it is preferable to slow the injection speed because molecular orientation can be suppressed and birefringence can be reduced. At low injection speeds, the gel generated during plasticization is transferred to the mold surface and spray marks are likely to be generated. Therefore, conventional transparent resin compositions could not be molded at the required injection speed. However, if the transparent resin composition of the present invention is used, it is possible to greatly suppress the generation of gel components as compared with conventional ones, so that it is possible to obtain a molded article having excellent transparency even at a low injection speed. it can.

  In order to obtain an optical component with high transparency, it is preferable that the mold temperature is low. Although depending on the transparent resin composition to be used, the mold temperature is preferably Tg-10 ° C. or lower based on the glass transition point of the transparent resin composition to be used. When the mold temperature exceeds the above range, the cooling time in the mold becomes longer during injection molding, which is not preferable.

  Examples of optical components include liquid crystal display elements, organic EL elements, plasma displays and electronic paper, display color filter substrates, nanoimprint substrates, transparent conductive films and transparent conductive films laminated with ITO and conductive resin layers, touch panels, light guide plates , Protective film, deflection film, retardation film, near infrared cut film, light diffusion film, antireflection film, high reflection film, transflective film, ND filter, dichroic filter, electromagnetic wave shield film, beam splitter, for optical communication Examples include filters, camera lenses, pickup lenses, optical lenses such as F-θ lenses and prisms, optical recording substrates such as MD, CD, and DVD.

<Manufacture of transparent resin composition>
The materials shown in Tables 1 and 2 were melt-kneaded at a cylinder temperature of 250 ° C. using a twin-screw extruder (manufactured by Nippon Steel Works Co., Ltd., trade name: TEX30) with the formulation shown in Tables 1 and 2. Examples and Comparison Example transparent resin composition pellets were obtained.

<Production of molded body>
Using the pellets of the obtained Examples and Comparative Examples, a flat plate of 70 mm × 70 mm × 1 mm was molded according to the following conditions using an injection molding machine (trade name: SE75D, manufactured by Sumitomo Heavy Industries, Ltd.) The lowest injection speed that did not occur was measured. The measurement results are shown in Table 1.

[Molding condition]
Cylinder temperature: 280-270-270-270-260 ° C
Mold temperature: 110 ° C setting Weighing: 40mm
VP switching: 7mm
Injection speed: 20 to 80 mm / s (measured every 5 mm / s)
Holding pressure: Holding pressure of 40 MPa × Holding time of 0.5 seconds, Holding pressure of 30 MPa × Holding time of 10 seconds Screw rotation speed: 150 rpm
Back pressure: 10MPa
Cushion amount: 4-5mm
Cooling time: 40 seconds

  As can be seen from the critical injection speeds of the examples and comparative examples, by using a transparent resin composition containing a rosin acid metal salt, a fatty acid ester or a fatty acid amide, and a fatty acid metal salt, the occurrence of spray marks is suppressed and transparent. It was confirmed that a highly molded product can be obtained.

  As can be seen from the results of the critical injection speeds of Examples 1 to 3, it was confirmed that the transparency was further improved if the metal element of the rosin acid metal salt and the metal element of the fatty acid metal salt were of the same kind.

Claims (8)

  A transparent resin composition comprising an amorphous cyclic olefin-based resin, a rosin acid metal salt, a fatty acid ester or a fatty acid amide, and a fatty acid metal salt.   The transparent resin composition according to claim 1, wherein the metal element of the rosin acid metal salt and the metal element of the fatty acid metal salt are of the same kind.   The transparent resin composition according to claim 1 or 2, wherein the metal element of the rosin acid metal salt is magnesium.   The transparent resin composition according to any one of claims 1 to 3, wherein the fatty acid ester or fatty acid amide is at least one selected from pentaerythritol tetrastearate and ethylene bisstearyl amide.   The transparent resin composition according to any one of claims 1 to 4, wherein the fatty acid metal salt is at least one selected from calcium stearate, magnesium stearate, and zinc stearate. The content of the rosin acid metal salt is 0.1% by mass to 5% by mass,
The transparent resin composition according to any one of claims 1 to 5, wherein a content of the fatty acid ester or the fatty acid amide is from 0.1% by mass to 3% by mass. The content of the rosin acid metal salt is 0.1% by mass to 5% by mass,
The transparent resin composition according to any one of claims 1 to 6, wherein the content of the fatty acid metal salt is 0.01% by mass to 0.1% by mass.   An optical component formed by molding the transparent resin composition according to claim 1.